Abstract: Aiming at the problem of reasonable formation pressure and reasonable flow pressure in low permeability oilfield, the variation law of formation pressure under different water cut, recovery degree and injection-production ratio was studied, a new method for calculating reasonable formation pressure was established, and the rational strat igraphic pressure range and the adjustment of pressure system in each block in Pubei area was obtained. Considering the effect of water content and liquid production on correcting the actual IPR curves of each fault block in Pubei area the reasonable flow pressure range of each fault block was calculated, the correction equation of inflow performance under various connected conditions of single well in Pubei area was established, and the reasonable flow pressure range of some single well was calculated. The results show that the evaluation method of formation pressure and flow pressure is more reasonable. According to the calculated minimum reasonable formation pressure and the minimum reasonable flow pressure of each fault block, the oil increasing effect of the adjustment well is obvious and the formation pressure tends to be reasonable. The gas influences of the wells were well controlled and the pump efficiencies were improved by adjusting flow pressure.

Key words: Formation pressure, IPR curve, Flow pressure, Pump efficiency

摘要： 针对低渗透油田合理地层压力保持水平及合理流压界定等问题,开展了不同含水率、采出程度和注采比下的地层压力变化规律研究,建立了合理地层压力计算新方法,给出了葡北地区各区块合理地层压力范围和压力系统调整意见。考虑含水率和产液量影响,修正了葡北地区各区块IPR实际曲线,计算了各区块合理流动压力范围,建立了葡北地区单井各种连通情况下流入动态修正方程,计算了部分单井合理流动压力范围。结果表明,研究的地层压力和流动压力评价方法更合理,依据计算的各区块最小合理地层压力及最小合理流动压力开展的压力系统调整井增油效果明显,地层压力趋于合理;通过调整流动压力井的气影响得到有效控制,泵效得到了提高。

关键词: 地层压力, IPR曲线, 流动压力, 泵效